(一)草鱼肠炎病 草鱼细菌性肠炎病又叫烂肠瘟,由细菌引起,病原体是肠型点状产气单胞杆菌。该病流行全国各养鱼地区,青鱼、草鱼中非常普遍,特别是当年草鱼种和二龄青鱼种。发病季节为每年3～10月,以6～7月为流行盛期。死亡率很高,一般为30%～50%,严重的可达90%以上。其主要 (A) Grass carp enteritis Grass carp bacterial enteritis is also called rotten intestinal blast, caused by bacteria, the pathogen is intestinal type Acellular Aeromonas. The prevalence of the disease throughout the country fish farming areas, herring, grass carp is very common, especially when the grass carp species and second-generation herring species. The season of onset is from March to October each year, with the peak season from June to July. Mortality is high, usually 30% to 50%, serious up to 90%. Its main